Salt meter



FIG. 1 is a top and left front perspective view of a salt meter showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a rear elevational view thereof. 

The ornamental design for a salt meter, substantially as shown. 